5.x CURRENT compile failure

With today's CVSup (fresh archive, removed /usr/src and /usr/obj first) 
a buildworld is failing at (error below).   What is wrong?

cc -O -pipe  -I/usr/src/lib/libc/include 
-I/usr/src/lib/libc/../../include -I/usr/src/lib/libc/i386 -D__DBI
NTERFACE_PRIVATE -I/usr/src/lib/libc/../../contrib/gdtoa -DINET6 
-I/usr/obj/usr/src/lib/libc -DPOSIX_MISTAK
E -I/usr/src/lib/libc/locale -DBROKEN_DES -DPORTMAP -DDES_BUILTIN 
-I/usr/src/lib/libc/rpc -DYP -DHESIOD -Ws
ystem-headers -Werror -Wall -Wno-format-y2k -Wno-uninitialized -c nslexer.c
/dev/stdout: In function `_nsyylex':
/dev/stdout:711: warning: label `find_rule' defined but not used
/usr/src/lib/libc/net/nslexer.l: At top level:
/dev/stdout:1678: warning: `yy_flex_realloc' defined but not used
*** Error code 1

Stop in /usr/src/lib/libc.
*** Error code 1

Stop in /usr/src/lib.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.
*** Error code 1     

Stop in /usr/src.       
*** Error code 1

Stop in /usr/src.